HDRI Not Appearing In Final Render
you can use this setup (which is essentially just a copy of what Easy HDRI just does for you automatically):

the good news: you made the node setup right.
the bad news: you have to change some parameters so that you can really see your background through your camera.
So first change to camera view and then zoom out. If you are zooming out far enough you will see the background image.
If you then &quot;play&quot; with the values (yours can differ) you can &quot;push&quot; your background image to the right place behind your camera.
my settings to &quot;see&quot; it were:

result: (after i changed your composite nodes to this:)


UPDATE ----
you can do it like this:
BUT...the more you glare (with fac) the less you will see the background.